Furnace



March 9 ,1926.

W. M. DUNCAN FURNACE Original Filed May 1l. 1922 2 Sheets-Sheet 1 March9 1926. '1,576,267

w. M. DUNCAN 1 FURNACE original Filed May ll, 1922 2 Sheets-Sheet 2Patented Mar. 9, 1926.

UNITED armes WILLIAM M. DNCAN, OF ALTON, ILLINOIS.

FURNACE. i

Application filed Mayill, 1922, Serial No. 560,118. Renewed January 29,1926.

To @ZZ whom it may concer-n: A

Be it known that I, WILLIAM M. DUNCAN, citizen of the United States ofAmerica, a resident of lton, in the county .of'Madisoin State ofIllinois, have invented certain new and useful Improvements in Furnaces,of which the following' is a full, clear, ant exact description,referencebeing had to the accompanying' drawings, forming a part of thisspecification.

My invention relates generally to a furnace equipped with a mechanicalstokerand other elements adapted to be associated therewith to providefor the combustion of anthracite coal on a traveling' grate, andparticulary to a means for feeding said coal to said traveling grate.

Furnaces provided with mechanical stokers of the chain grate type arebeing' used quite extensively in connection with stills, and in theprior structures the coal receptacles were usually located at the frontof the furnaces and at points beyond the end of the stills, the chain`grate traveling` under the coal receptacle and carrying the fuel towardthe rear of the furnace. Itis not always convenient to so locate thechain grate with respect to the end of the still as to permit the frontend of said chain crate to extend beyond said still end, and this hasbeen necessary in the past due to the fact that an outer coal receptaclemust be provided which discharges the coal directly onto the inwardlymoving grate. The furnace disclosed herein diiers essentially from theprior structures referred to in thatthe chain grate moves in a directionfrom the rear of the furnace to the front thereof, and the coalreceptaclewhich discharges coal onto the grate is within the lire box`and owing` to this difference the furnace may be located at any placeunder the still, regardless of the proximity of the still ends.

In the preferred Iform of the invention, the coal receptacle is locatedwithin the tire box at a point above the rear portion of the travelingchain grate, the grate passing under the coal receptacle at the rear ofthe furnace carries the fuel toward the front of said furnace, andaineans is provided whereby the coal is conducted from an outer coalreceptacle to the coal receptacle Within the fire box, from which saidcoal is discharged onto the chain grate.

Another advantage in having the coal receptacle located within the firebox arises from the fact that the coal will be subjected directly to theheat of the lire box, and bc'- cause of this fact said coal will beplaced in an incandescent state before itreaches the traveling chaingrate, and it will, therefore, ignite immediately after leaving thereceptacle.

y VViththe foregoing` view, the invention comprises the novelconstruction, combination and arrangement of parts hereinafter morespecilically described and illustrated in the accompanyingl drawingswherein is shown the preferred enibodinient of the invention. However,it isto be 'understood that the invention comprehends changes,variations and modifications which come'within the scope of theclaimhereunto appended.

Fig. I is a vertical section of a portion of mounted, and 2 designatesthe tracks located between said side walls. Side frames Band 4 areprovided with wheels which rest upon the tracks 2. A drive shaft 5,inountedin the side frames at the front of thegrate, is provided with aseries of sprocket wheels 6 which lie between the side frames 3 and 4l.An idle shaft 7 at the rear of the grate is provided with idle wheels 8.The wheels o and 8 constitute supporting elements for a fuel carrier intlie form of a traveling grate made up of numerous grate members Aarranged in endess rows. Each grate member A is provided with twotransverse openings adjacent to its ends for the reception of two of thepivot rods 9. In the operation of the chain grate, the teeth on thesprocket wheels (i engage the pivot rods 9 between the grate members Awhereby the grate is driven iny the i direction indicated by the arrowsVin F ig. I. i Y

Located within the fire box of the furnace is a coal receptacle lO (Fig.I), said coal receptacle being located immediately above the rearportion of the traveling grate. This receptacle is open at thetop toreceive the and other objects in I coal, and open at the bottom topermit the discharge of said coal onto the grate. A second coalreceptacle Il is located outside of the boiler B ina plane above thecoal receptacle l0, and is' provided with a dis charge opening at thebottom thereof. The means for conducting the coal from the coalreceptacle 11 to the coal receptacle l0 comprises an inclined tube 12Which communi- Cates with the discharge opening in the coal receptacle11 and passes through the boiler B in the manner illustrated in F ig. Iofthe drawings. The opposite ends of the inclined tube .l2 may be brazedto the end Wall and body Wall of the boiler so that there will be nodanger ot' the contents of the boiler leaking therefrom at the pointswhere said ytube passes through the boiler Walls. y The lower open endot the coal-conchicting tube l2 is' located immediately vabove the coalrecep tacle 10 Within the ire boX or' the furnace, so that when coal isplaced in thecoal receptacle 11, said coal will pass through the tune l2and be deposited in the coal' receptacle 10,`

from which said coal Will be'ieventually drawn by the traveling grate tobe consumed in the usual manner thereon.

To provide a means for regulating the feeding of the coal to the coalreceptacle 10 with I employ a rotary feeder F which is of ordinaryconstruction.

I claim:

In a furnace provided With a boiler, a traveling grate Within thefurnace fire box, a portion of said traveling grate being in vert-icalalinement with said boiler, a coal receptacle located in said lire boximmediately above said grate, said coal receptacle having an open bottompermitting coal therein to be supported by the grate, a second coalreceptacle outside of the furnace ireybox and at an end ot said boiler,the last mentioned coal receptacle being in a higher plane than thefirst mentioned receptacle, and acoal conducting member extendeddiagonally through the boiler, said coal `conducting member being inconnnunication the second mentioned coal receptacle' and said. coalconductor terminating at the bottom or' the boiler and at a pointimmediately above the iirst mentioned coal recep; tacle whereby coal maypass from the second lmentioned coal receptacle through said coalconductor and be discharged into said first mentioned coal receptacle.

In testimony that I claim the foregoing l hereunto a'f'rix my signature.y

WILLIAJH `M. DUNCAN.

